Micros of Malevolent Mystique

The Micros of Malevolent Mystique is a Fifth Doctor story.

Plot
The TARDIS arrives in London in 1984. After a bit of wandering, The Doctor and his companions find themselves on grounds belonging to esteemed scientist Professor Tether, who after noticing the group from live surveillance footage, walks outside to greet them.

Having heard about The Doctor and his work for UNIT, Professor Tether invites them into his laboratory. He reveals that he has been manufacturing a line of microcomputers known as Magic Micros, which he predicts will become a success among schoolchildren all over the British Isles. He adds that the micros will connect to a singlular supercomputer via built-in radio transmitters.

However, while looking around, The Doctor recognizes the supercomputer and realizes that it's WOTAN.

Wanting to learn more about his project, The Doctor asks if he could take a look at the supercomputer. Tether declines this request, citing technical difficulties. The Doctor begins to have suspicions about the professor and soon realizes that Sam Tether is an anagram of The Master. Laughing can be heard in the background.

Professor Tether then reveals his ambitions of connecting all of his micros to one single supercomputer. Upon being asked by The Doctor why, he explains by stating that since consumers are not interested in buying newer expensive models, periodic upgrades are necessary, something that can only be achieved through linking it through his supercomputer.

The supercomputer consists of two consoles and is grayish green unveiling the machines. The Doctor soon realizes it's WOTAN, somehow brought back.


 * The Master resurrects WOTAN by scavenging objects such as magnetic tape, remnants from the Apocalypse Clock like the processor, the hardware from The Vault, etc. He got access by posing as a scientist named Professor Sam Tether (a name derived from a French word meaning head). He wants to use his computers to brainwash and enslave its users, thus beginning his plan to take over the world. Citizens complain of weird noises in town